    [this _system]
    (-> this
        (assoc :jruby-runtime (create-jruby-runtime))
-       (assoc :preview-gem-umm-version
-              (or (get-preview-gem-umm-version) default-preview-gem-umm-version))))
+       (assoc :preview-gem-umm-version (get-preview-gem-umm-version))))
+
   (stop
    [this _system]
    (dissoc this :jruby-runtime)))

   [clojure.java.io :as io]
   [clojure.string :as str]
   [cmr.common.lifecycle :as l]
   [cmr.common.log :refer (debug info warn error)]
   [cmr.umm-spec.migration.version-migration :as vm]
   [cmr.umm-spec.umm-json :as umm-json]
   [cmr.umm-spec.versioning :as umm-version])

(defn- get-preview-gem-umm-version
  "Get the UMM schema version that is defined in preview gem."
  []
  (-> preview-gem-umm-version-config-file
      io/resource
      slurp
      str/trim))

;; Allows easily evaluating Ruby code in the Clojure REPL.
(comment
